First I cleaned up all the skin using the healing brush. Then I switched to the paint brush, generally 100% opacity, 2% flow, though I'll drop the opacity to 75% for very delicate areas. I selected a light-toned area of skin to use as my foreground color, and then set the brush to color dodge and cleaned up the shadows on the left-hand side of the forehead and on the chin. This can leave the skin looking somewhat flat, untextured, and unnatural. I tried my best to preserve what texture I could. Overall, this worked fine, but the forehead was still a little flat so I chose a section of cheek near the nose, where there was skin texture due to pores, and created a new texture with it. Then I went back up to the forehead with the skin texture I had just made and the texture stamp. I also wanted to slightly accentuate the cheekbone but not overdo it. So just as if you were applying blush, I chose a nice pink color and lightly painted the cheekbone area with the brush set to overlay. In some places, such as the chin, it was necessary to switch the brush to screen mode with a light flesh color selected, in order to lighten the shadows while smoothing the skin at the same time.